687500domain: NAppears in sequencesDenominators used to compute the column sequences of triangle A090217.at n=4A090436Numbers n that are the hypotenuse of exactly 6 distinct integer-sided right triangles, i.e., n^2 can be written as a sum of two squares in 6 ways.at n=27A097219Increasingly larger values in A110412.at n=21A111632